Blizzard has confirmed that DLC content for the latest installment of the Diablo franchise has already been worked on before the game’s official launch.

The details:

Diablo IV's general manager, Rod Fergusson, revealed in a new episode of the Kinda Funny podcast that the development team had already begun work on two different expansions for the game ahead of its June 6 release. "We have to build things in parallel," Fergusson said. "Right now as I sit here, we're about to launch the main game; we're finishing up season one; we're working on season two; we're working on expansion one; we're kicking off expansion two; all that's happening right now."
The studio previously confirmed that these expansions will be paid, and it is believed that they will follow a similar format to those for previous Diablo titles, adding new major story content, classes, and items. Diablo IV will also receive more story content "every three months," presumably alongside a new battle pass as part of its live-service structure, but the content will most likely be minor story additions to bridge the game's story between expansions.
So far, both critics and players have praised the game for its satisfying combat and gameplay loop, which builds on the franchise's previous entry. The story appears to be the game's low point thus far, but it doesn't appear to have bothered many fans. The early access period appears to have been a huge success as well, with only a small number of people reporting issues with the game's servers; however, the game's full launch has run into some issues, with players receiving error code 300008, which Blizzard is currently working on fixing.

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Diablo IV’s DLCs are already in the works